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05-16-2011, 05:13 AM   #1
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K200D Dead / Stuck Pixel ?

Hi, Wondering if I have a dead pixel on my camera?

It's a K200D and I started noticing a bright star like spot some times on peoples faces and such.

I zoomed in and sure enough there is a bright white dot with 4 like duller star effect dots around it.

I tried cleaning the sensor with an Air-Rocket, tried the camera's in built sensor clean (shake) several times, lastly tried the pixel mapping feature from the setup menu several times. .

I also tried taking a black picture with the lens cap on and also a picture with no lens at all.

The dot is always there in the exact same spot exactly the same as before.

I have attached a .JPG taken with lens cap on.
Also the second small image is a crop of the area containing the sus pixel.

To view the pixel, zoom in all the way in the Pentax picture browser and then scroll up the screen. You will see it about 1/3 down from the top of the image on the right hand side.

It just seems to be this one pixel. I see no others.

Assuming this is a dead pixel. Why doesn't the camera map it out?
Is there a fix? Firmware upgrade perhaps?

Camera has only taken 2239 pictures.

.-.-.

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Last edited by vk4akp; 05-16-2011 at 05:22 AM. Reason: spelling mistake
05-16-2011, 08:04 AM   #2
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Better would probably have been to post a crop showing just the affected area. but your description seems clear enough, and yes, it sounds like a dead/stuck pixel.

As for why the camera didn't map it out, you didn't specifically mention running the pixel mapping function, but assuming you did, then it should have done so for JPEG, but I don't think that would affect RAW output. On the other hand, most RAW processors are pretty good about noticing these and dealing with them automatically. If you didn't run the pixel mapping function, well, then that would explain why the camera didn't do it for you. See the Setup menu. Although it seems some pixels aren't *completely* dead/stuck but are temperature sensitive - they start misbehaving at long shutter speeds. I suspect the pixel mapping function wouldn't deal with those.
05-16-2011, 09:18 AM   #3
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Yep, tried the Pixel mapping function several times. (See my original post).

>> " lastly tried the pixel mapping feature from the setup menu several times. "

Made no difference.

I also flashed the camera to the latest firmware after posting the message.

Made no difference, but I didn't expect it to really. As it wasn't mentioned in the release notes.

It's a strange one.

I have looked back through old photo's and it's hard to spot on certain images. But I think it's been there for a while if not from new.

Disappointing really.

I can't understand why the mapping feature doesn't work.

Oh and I tried to crop the image and failed. So sorry for the big black picture. LOL
I guess I need a decent paint package.
.-.-.
05-16-2011, 12:49 PM   #4
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Sorry, missed the line where you said you tried it. Do you see this at all shutter speeds? If so, I agree it's odd. But dead pixels are pretty normal, and as you example shows, seldom an issue in real world images.

05-16-2011, 01:29 PM   #5
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I didn't know there was new firmware for this model?

I thought the original firmware was the only version ever released?
05-16-2011, 02:36 PM   #6
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Yet another reason to shoot raw. I never see hot pixels as Lightroom automagically fixes them before displaying.

Weird that the pixel mapping doesn't get rid of it, though.
05-16-2011, 02:45 PM   #7
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QuoteOriginally posted by johngs Quote
I didn't know there was new firmware for this model?

I thought the original firmware was the only version ever released?
No, a few months ago a new version was released to deal with some sort of new SD card or something. I'm sure Google will find it for you easily enough.
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